dxgi: Return a duplicate frame latency event.

dlls/dxgi/swapchain.c

@@ -2564,10 +2564,24 @@ static HRESULT STDMETHODCALLTYPE d3d12_swapchain_GetMaximumFrameLatency(IDXGISwa
 static HANDLE STDMETHODCALLTYPE d3d12_swapchain_GetFrameLatencyWaitableObject(IDXGISwapChain4 *iface)
 {
     struct d3d12_swapchain *swapchain = d3d12_swapchain_from_IDXGISwapChain4(iface);
+    HANDLE dup;
+    BOOL ret;
 
     TRACE("iface %p.\n", iface);
 
-    return swapchain->frame_latency_event;
+    if (!swapchain->frame_latency_event)
+        return NULL;
+
+    ret = DuplicateHandle(GetCurrentProcess(), swapchain->frame_latency_event, GetCurrentProcess(),
+            &dup, 0, FALSE, DUPLICATE_SAME_ACCESS);
+
+    if (!ret)
+    {
+        ERR("Cannot duplicate handle, last error %lu.\n", GetLastError());
+        return NULL;
+    }
+
+    return dup;
 }
 
 static HRESULT STDMETHODCALLTYPE d3d12_swapchain_SetMatrixTransform(IDXGISwapChain4 *iface,

dlls/dxgi/tests/dxgi.c

@@ -6981,13 +6981,14 @@ static void test_frame_latency_event(IUnknown *device, BOOL is_d3d12)
     IDXGISwapChain1 *swapchain1;
     IDXGIFactory2 *factory2;
     IDXGIFactory *factory;
+    HANDLE event, event2;
     UINT frame_latency;
     DWORD wait_result;
     ULONG ref_count;
     unsigned int i;
-    HANDLE event;
     HWND window;
     HRESULT hr;
+    BOOL ret;
 
     get_factory(device, is_d3d12, &factory);
 
@@ -7052,7 +7053,20 @@ static void test_frame_latency_event(IUnknown *device, BOOL is_d3d12)
     IDXGISwapChain1_Release(swapchain1);
 
     event = IDXGISwapChain2_GetFrameLatencyWaitableObject(swapchain2);
-    ok(!!event, "Got unexpected event %p.\n", event);
+    ok(!!event, "Got unexpected NULL event.\n");
+
+    /* a new duplicate handle is returned each time */
+    event2 = IDXGISwapChain2_GetFrameLatencyWaitableObject(swapchain2);
+    ok(!!event2, "Got unexpected NULL event.\n");
+    ok(event != event2, "Got the same event twice %p.\n", event);
+
+    ret = CloseHandle(event);
+    ok(!!ret, "Failed to close handle, last error %lu.\n", GetLastError());
+    ret = CloseHandle(event2);
+    ok(!!ret, "Failed to close handle, last error %lu.\n", GetLastError());
+
+    event = IDXGISwapChain2_GetFrameLatencyWaitableObject(swapchain2);
+    ok(!!event, "Got unexpected NULL event.\n");
 
     /* auto-reset event */
     wait_result = WaitForSingleObject(event, 0);